结合地质力学的原位燃烧中试模拟研究进展

IF 2.1 4区 工程技术 Q3 ENERGY & FUELS
Y. Li, E. Manrique, A. Kovscek
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引用次数: 2

摘要

原位燃烧(ISC)是一种很有前途的热采油方法,对深层油藏有利,与蒸汽注入相比,可能需要更少的能量,而且机会成本低。尽管世界各地都有成功的ISC项目,但仍然存在挑战,包括在现场监测燃烧前沿进展、描述多尺度物理过程、全面表征原油动力学以及在现场规模上模拟ISC方面存在困难。这项工作在ISC试点项目的规模上预测了燃烧前沿的传播和热诱导应力的影响。利用地质力学模型对储层变形进行表征,探讨燃烧前缘进展与储层及地表变形的相关性。我们直接从燃烧管实验中对反应动力学进行了放大,并对实验室规模的模型进行了校准,与实验测量结果进行了比较。然后,我们将数值模拟升级为结合地质力学模型的3D几何图形。燃烧管的长度为6.56英尺(2米),而3D模型的尺寸为1440英尺× 1440英尺(439米)× 1400英尺(427米)。弹性性能由杨氏模量和泊松比定义,而塑性性能由莫尔-库仑模型定义。敏感性研究检验了模型的可靠性,表明反应过程和地质力学响应不受网格块尺寸和储层非均质性的显著影响。最后,开发了一个覆盖面积为5960英尺(1817米)× 4200英尺(1280米)的现场尺度模型,我们成功地观察到了ISC模拟,包括空气喷射开始时的点火。根据化学动力学,温度立即升高到800°C(1400°F)以上。温度历史表明,燃烧前缘以0.16 ft/D (0.049 m/ D)的平均速度从注入井传播到储层。与地下ISC进展相关的地表变形图。由于ISC引起的地表隆起范围从0.1英尺(0.03米)到几英尺,这取决于岩石性质和地下事件。该概念验证模型表明,利用干涉合成孔径雷达(InSAR)和/或倾斜仪监测地下动态燃烧锋面位置,探测地表运动具有很强的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Progress Toward Pilot-Scale Simulation of In-Situ Combustion Incorporating Geomechanics
In-situ combustion (ISC) is a promising thermal enhanced oil recovery method with benefits for deep reservoirs, potentially lesser energy requirements as compared to steam injection, and low opportunity cost. Although successful ISC projects have been developed all over the world, challenges still exist including difficulties in monitoring combustion-front progress in the field, describing multiscale physical processes, characterizing crude oil kinetics fully, and simulating ISC at field scale. This work predicts combustion front propagation and the effect of thermally induced stress at the scale of an ISC pilot project. Reservoir deformation was characterized by a geomechanical model to investigate the correlation of combustion front progress with reservoir and surface deformation. We upscaled the reaction kinetics directly from combustion tube experiments and calibrated the laboratory-scale model compared with experimental measurements. We then upscaled numerical simulation to a 3D geometry incorporating a geomechanical model. The change in scale is significant as the combustion tube is 6.56 ft (2 m) in length, whereas the dimensions of the 3D model are 1,440 ft by 1,440 ft (439 m) by 1,400 ft (427 m). The elastic properties were defined by Young’s modulus and Poisson’s ratio, whereas the plastic properties were defined by a Mohr-Coulomb model. A sensitivity study examined the reliability of the model, showing the reaction progress and geomechanical responses were not significantly impacted by gridblock dimensions and reservoir heterogeneity. Finally, a field-scale model was developed covering an area of 5,960 ft (1817 m) by 4,200 ft (1280 m). We observed successful ISC simulation including ignition as air injection started. The temperature increased immediately to more than 800°C (1,400°F) based on the chemical kinetics implemented. The temperature history indicated that the combustion front propagated from the injection well into the reservoir with an average velocity of 0.16 ft/D (0.049 m/d). A surface deformation map correlated with the progress of ISC in the subsurface. Land surface uplift because of ISC ranges from 0.1 ft (0.03 m) to several feet, depending on the rock properties and subsurface events. This proof-of-concept model indicated strong potential to detect the surface movement using interferometric synthetic aperture radar (InSAR) and/or tiltmeters to monitor dynamically combustion front positions in subsurface.
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来源期刊
CiteScore
5.30
自引率
0.00%
发文量
68
审稿时长
12 months
期刊介绍: Covers the application of a wide range of topics, including reservoir characterization, geology and geophysics, core analysis, well logging, well testing, reservoir management, enhanced oil recovery, fluid mechanics, performance prediction, reservoir simulation, digital energy, uncertainty/risk assessment, information management, resource and reserve evaluation, portfolio/asset management, project valuation, and petroleum economics.
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